class Point:
    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y

    def __del__(self):
        class_name = self.__class__.__name__
        print(class_name, '销毁')


pt1 = Point()
pt2 = pt1
pt3 = pt1
print(id(pt1), id(pt2), id(pt3))  # 打印对象的id
del pt1
del pt2
del pt3
